Power supply, tester, and stabilizer

A test apparatus that tests an electronic device, comprising:

• a current output section that outputs an output current that includes a power supply current supplied to the electronic device;
• a low pass filter that receives an output voltage of the current output section and allows a low frequency component with a frequency lower than a preset cutoff frequency to pass through;
• an excess voltage restricting load section that is connected between the current output section and a ground, in parallel with the electronic device, and that consumes an excess voltage restricting current, which is at least a portion of the output current from the current output section, when a load is turned on and stops the consumption of the excess voltage restricting current when the load is turned off;
• an excess voltage restricting control section that keeps the excess voltage restricting load section turned off when the output voltage of the current output section is less than an upper reference voltage, which is obtained by adding together a voltage output by the low pass filter and a preset upper offset voltage, and that turns on the excess voltage restricting load section when the output voltage is greater than or equal to the upper reference voltage;
• a current measuring section that measures the power supply current supplied to the electronic device;
• and
• a judging section that judges whether the electronic device is defective based on a result of the measurement by the current measuring section.

A stabilizing apparatus equipped in a current output apparatus that supplies an output current to an electronic device as a power supply current, comprising:

• a low pass filter that receives an output voltage of the current output apparatus and allows a low frequency component with a frequency lower than a preset cutoff frequency to pass through;
• an excess voltage restricting load section that is connected between the current output apparatus and a ground, in parallel with the electronic device, and that consumes an excess voltage restricting current, which is at least a portion of the output current from the current output apparatus, when a load is turned on and stops the consumption of the excess voltage restricting current when the load is turned off;
• and
• an excess voltage restricting control section that keeps the excess voltage restricting load section turned off when the output voltage of the current output apparatus is less than an upper reference voltage, which is obtained by adding together a voltage output by the low pass filter and a preset upper offset voltage, and that turns on the excess voltage restricting load section when the output voltage becomes greater than or equal to the upper reference voltage.